That is correct. In general the NGK Ruthenium plugs are a better plug. This is not something to cheap out on. I don't understand saving a few bucks on something as important as plugs. You do you. You can search on here for Spark Plugs, and see the comments from those running the better plugs, and the improvements they have seen. Don't have to take my word for it. Plus, if you haven't changed them yet, and you are at 104K, you should do them more often than that. Yes, ford says 100K, but every set I have pulled even as early as 30-40K, the gap has not been consistent. That is the important part. Could probably have regapped, and put back in, but if they are out, they are getting replaced with better for me.
So who knows, you could have seen 25-26 MPG(What we saw with our 2017 on the highway regularly) with the above mentioned plugs, gapped at .028. So, you never know.
Also, there will be people that say the OEM are made by NGK, they are, but they aren't the same as the NGK Ruthenium, they are mass produced to Ford specs to meet a basic need and price point.